dual-boot of centOS and Ubuntu

[newcfd]

I installed centOS in my computer before and now want to add Ubuntu to it.
When I used GParted to check the partition table, there is only one
partition for CentOS(not three, swap, root and home) with a key sign
for it which means it is in use. May I still go ahead to shrink this partition
to make rooms for Ubuntu? Any dangers? Thanks for you help

[james_moore2]

You should be able to use the installer and there should be an option called "Install along with centOS" or something like that if there isnt please provide pictures and I will try to help you from there.

[newcfd]

No option for "Install along with centOS". I did not see it in the installation process. Please see the attached the partition file.



You should be able to use the installer and there should be an option called "Install along with centOS" or something like that if there isnt please provide pictures and I will try to help you from there.

[newcfd]

found this link
http://ubuntuforums.org/showthread.php?t=2054664 (http://ubuntuforums.org/showthread.php?t=2054664)

"You cannot use gparted on LVM and have to use some other tools also."
GParted doesn’t have support for LVM disks.

the latest version of Gparted (0.14) supports resizing LVM physical volumes. The one I use is 0.18. It may work.

[yancek]

You have CentOS installed using LVM and as you can see in the image you posted, it uses the entire drive. You will have to resize (shrink) that partition to make room on which to install Ubuntu. You can't do it the way you resize standard partitions. The links oldfred posted should have some info, otherwise just do an online search for resize lvm.

[newcfd]

deactivated the partition /dev/sda2 and tried to use GParted to reduce its size. It does not work. I can set a size for free space. But after I pressed return, it went back to zero.
checked GParted home and found it supports lvm2 pv. Why does not it work?

[newcfd]

I managed to reduce the size of LVM partition. But I can not see the unused partition I just reduced from the LVM partition in the installation(Installation type: something else).

[oldfred]

I still do not know LVM, but how you resize LVM is different than standard partitions with gparted.
The newer versions of Ubuntu include LVM as part of desktop installer, so installer should see the LVM.

Some links that may be helpful.
LVM - Logical Volume Management.
Advantages/Disadvantages LVM Post #9
http://ubuntuforums.org/showthread.php?t=1586328&p=9917145#post9917145
https://wiki.ubuntu.com/Lvm
https://help.ubuntu.com/community/UbuntuDesktopLVM
http://www.tutonics.com/2012/11/ubuntu-lvm-guide-part-1.html
2014_02_22_Preparing Logical Volumes For Ubuntu Installations
http://members.iinet.net/~herman546/2014_02_22_Preparing%20Logical%20Volumes%20For%20U buntu%20Installations.html
http://askubuntu.com/questions/470632/install-lvm-dual-boot-with-windows